The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/i386/isa/elink.c

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    1 /*
    2  * Copyright (c) 1994 Charles Hannum.  All rights reserved.
    3  *
    4  * Redistribution and use in source and binary forms, with or without
    5  * modification, are permitted provided that the following conditions
    6  * are met:
    7  * 1. Redistributions of source code must retain the above copyright
    8  *    notice, this list of conditions and the following disclaimer.
    9  * 2. Redistributions in binary form must reproduce the above copyright
   10  *    notice, this list of conditions and the following disclaimer in the
   11  *    documentation and/or other materials provided with the distribution.
   12  * 3. All advertising materials mentioning features or use of this software
   13  *    must display the following acknowledgement:
   14  *      This product includes software developed by Charles Hannum.
   15  * 4. The name of the author may not be used to endorse or promote products
   16  *    derived from this software without specific prior written permission.
   17  *
   18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   19  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   20  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   21  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   22  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   23  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   24  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   25  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   26  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   27  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   28  *
   29  * $FreeBSD: src/sys/i386/isa/elink.c,v 1.5.8.1 1999/09/05 08:12:33 peter Exp $
   30  */
   31 
   32 /*
   33  * Common code for dealing with 3COM ethernet cards.
   34  */
   35 
   36 #include <sys/types.h>
   37 #include <sys/cdefs.h>
   38 
   39 #include <machine/cpufunc.h>
   40 
   41 #include <i386/isa/elink.h>
   42 
   43 /*
   44  * Issue a `global reset' to all cards.  We have to be careful to do this only
   45  * once during autoconfig, to prevent resetting boards that have already been
   46  * configured.
   47  */
   48 void
   49 elink_reset()
   50 {
   51         static int x = 0;
   52 
   53         if (x == 0) {
   54                 x = 1;
   55                 outb(ELINK_ID_PORT, ELINK_RESET);
   56         }
   57 }
   58 
   59 /*
   60  * The `ID sequence' is really just snapshots of an 8-bit CRC register as 0
   61  * bits are shifted in.  Different board types use different polynomials.
   62  */
   63 void
   64 elink_idseq(p)
   65         register u_char p;
   66 {
   67         register int i;
   68         register u_char c;
   69 
   70         c = 0xff;
   71         for (i = 255; i; i--) {
   72                 outb(ELINK_ID_PORT, c);
   73                 if (c & 0x80) {
   74                         c <<= 1;
   75                         c ^= p;
   76                 } else
   77                         c <<= 1;
   78         }
   79 }

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